diff --git a/OpenEXR/IlmImf/CMakeLists.txt b/OpenEXR/IlmImf/CMakeLists.txt
index 7c165bd4c..b13416a10 100644
--- a/OpenEXR/IlmImf/CMakeLists.txt
+++ b/OpenEXR/IlmImf/CMakeLists.txt
@@ -17,6 +17,7 @@ ADD_CUSTOM_COMMAND (
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/b44ExpLogTable.h
   COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/b44ExpLogTable > ${CMAKE_CURRENT_BINARY_DIR}/b44ExpLogTable.h
   DEPENDS b44ExpLogTable
+  WORKING_DIRECTORY ${ILMBASE_PACKAGE_PREFIX}/lib
 )
 
 ADD_EXECUTABLE ( dwaLookups
@@ -34,6 +35,7 @@ ADD_CUSTOM_COMMAND (
   OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/dwaLookups.h
   COMMAND ${CMAKE_CURRENT_BINARY_DIR}/${CMAKE_CFG_INTDIR}/dwaLookups > ${CMAKE_CURRENT_BINARY_DIR}/dwaLookups.h
   DEPENDS dwaLookups
+  WORKING_DIRECTORY ${ILMBASE_PACKAGE_PREFIX}/lib
 )
 
 SET ( ILMIMF_SRCS